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                    <h1 id="浮动应用"><a href="#浮动应用" class="headerlink" title="浮动应用"></a>浮动应用</h1><h2 id="制作导航栏"><a href="#制作导航栏" class="headerlink" title="制作导航栏"></a>制作导航栏</h2><ul>
<li><p>设置文本或者内容 在一个盒子中间位置的两种方式：</p>
<ul>
<li>给盒子一个上下相同，左右相同的内边距 使内容在盒子的中间。这种方式适用盒子大小不固定的场景。</li>
<li>当盒子有固定的尺寸时，水平方向设置<code>text-align:center</code>使内容居中。垂直方向使得<code>行高=盒子高度</code> 以达到文本或内容居中的效果。</li>
</ul>
</li>
</ul>
<h2 id="页面的布局"><a href="#页面的布局" class="headerlink" title="页面的布局"></a>页面的布局</h2><h3 id="经典布局"><a href="#经典布局" class="headerlink" title="经典布局"></a>经典布局</h3><ul>
<li>最外面的是版心容器：<code>&lt;div class=&quot;main&quot;&gt;&lt;/main&gt;</code><ul>
<li>页面布局首先需要设置版心（版面的中心区域）的大小，一般是”1000px居中” 。</li>
</ul>
</li>
<li>垂直的上中下的布局：</li>
</ul>
<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">div</span> <span class="attr">class</span>=<span class="string">&quot;main&quot;</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">div</span> <span class="attr">class</span>=<span class="string">&quot;header&quot;</span>&gt;</span></span><br><span class="line">        头部</span><br><span class="line">    <span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">div</span> <span class="attr">class</span>=<span class="string">&quot;center&quot;</span>&gt;</span></span><br><span class="line">        中间</span><br><span class="line">    <span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">div</span> <span class="attr">class</span>=<span class="string">&quot;footer&quot;</span>&gt;</span></span><br><span class="line">        底部</span><br><span class="line">    <span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br></pre></td></tr></table></figure>

<ul>
<li>中间区域 分为侧边栏和内容区</li>
</ul>
<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">div</span> <span class="attr">class</span>=<span class="string">&quot;center&quot;</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">div</span> <span class="attr">class</span>=<span class="string">&quot;left&quot;</span>&gt;</span></span><br><span class="line">        侧边栏</span><br><span class="line">    <span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">div</span> <span class="attr">class</span>=<span class="string">&quot;right&quot;</span>&gt;</span></span><br><span class="line">        右边内容</span><br><span class="line">    <span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br></pre></td></tr></table></figure>

<a id="more"></a>

<h3 id="圣杯布局"><a href="#圣杯布局" class="headerlink" title="圣杯布局"></a>圣杯布局</h3><p>圣杯布局是最早出现在国外网站上的一个说法。在西方，圣杯是表达“渴求之物”的意思；它是一种两栏或者三栏的布局方式，其中核心点是 主体内容区宽度可变，也就是自适应页面大小。</p>
<h4 id="两栏布局"><a href="#两栏布局" class="headerlink" title="两栏布局"></a>两栏布局</h4><ul>
<li><p>方案一：</p>
<p>设置父容器为一个固定宽度，让左右盒子都浮动，右边盒子的大小为计算值</p>
</li>
</ul>
<ul>
<li>方案一：</li>
</ul>
<ol>
<li>设置HTML结构：父容器中包含左边和右边区域</li>
<li>CSS初始化盒子总大小为一个或者`min-width值以自适应页面的宽度</li>
<li>设置左边区域和右边区域的大小，添加可视背景</li>
<li>设置左边区域左浮动，右边区域外边距为（盒子宽度+间距）</li>
<li>清除父容器的浮动</li>
</ol>
<h4 id="三栏布局"><a href="#三栏布局" class="headerlink" title="三栏布局"></a>三栏布局</h4><ul>
<li>方案一：</li>
</ul>
<ol>
<li>设置HTML结构，显示左边盒子，然后右边盒子 最后中间盒子</li>
<li>初始化整个容器自适应宽度，三栏垂直分布 分别设置它们的大小以及可视背景</li>
<li>让左边区域左浮动，右边区域右浮动 中间区域设置左右边距为（盒子宽度+间距）</li>
<li>清除父容器的浮动</li>
</ol>
<ul>
<li>方案二：</li>
</ul>
<ol>
<li>设置HTML结构，出现顺序依次是中间内容区，然后是左边区域，再是右边区域</li>
<li>CSS初始化让整个容器自适应宽度，三栏垂直分布。分别设置中间区域、左右两边的大小和可视背景。中间区域宽度100%比较合适，但不能小于(父盒子宽度 - 左右盒子)</li>
<li>三栏同时左浮动，设置左边区域外边距为<code>-中间区域宽度%</code>，右边区域的外边距为<code>-盒子宽度</code>，清除父盒子浮动</li>
<li>给中间区域嵌套子盒子，设置其外边距为（左右盒子宽度+间距）</li>
</ol>
<h1 id="定位属性"><a href="#定位属性" class="headerlink" title="定位属性"></a>定位属性</h1><p>网页中的一个元素（盒子），其在网页上的位置，有如下三种方式来确定：</p>
<ul>
<li><p>标准模式：普通文档流</p>
<p>标准模式就是元素没有进行浮动也没有进行明确定位时的“默认模式”，这也被称为<strong>标准流</strong>。</p>
</li>
<li><p>浮动模式：浮动层的元素</p>
<p>浮动模式就是使用float属性使其往左边或右边进行浮动而表现出来的位置。这被称为<strong>脱标流</strong>。</p>
</li>
<li><p>定位模式：定位元素 可以在普通文档流中 也可以是定位层</p>
<p>就是使用明确的“位置设定”信息来让一个盒子定位到指定的位置。</p>
<p>定位模式中，有的是标准流的，有的是脱标流的。</p>
</li>
</ul>
<p>定位设定可以确定一个盒子在下述两个方面的位置：</p>
<ol>
<li>在（x,y）平面上所处位置。</li>
<li>在高度（z轴）方向的位置（层次）。</li>
</ol>
<p>在css中 使用position属性 设置元素的定位方式：</p>
<ul>
<li>static：默认静态非定位的元素</li>
<li>absolute：绝对定位，相对于父元素设置坐标，前提是该父元素 拥有定位属性，如果没有定位 依次向上查找 直到body。absolute绝对定位或脱离普通文档流，后续元素可以补充它的位置</li>
</ul>
<p>​    </p>
<ul>
<li>relative：相对定位，它是相对于自己原先在网页中的位置来设置坐标。并且它定位之后 会保留原先的位置</li>
</ul>
<ul>
<li>fixed：固定位置，是相对浏览器窗口来设置坐标，它也脱离文档流，一般使用fixed来实现吸顶效果。</li>
</ul>
<h1 id="零碎和补遗"><a href="#零碎和补遗" class="headerlink" title="零碎和补遗"></a>零碎和补遗</h1><ul>
<li>pre：格式化输出标签，它能让以代码编辑的格式在页面中显示。</li>
</ul>
<ul>
<li>cursor：设置鼠标在某个盒子上的时候的光标形状。</li>
</ul>
<ul>
<li>box-shadow：设置盒子的阴影效果</li>
</ul>
<ul>
<li>text-shadow：设置文本的阴影效果</li>
</ul>
<ul>
<li>border-radius：设置圆角边框</li>
</ul>
<ul>
<li><p>text-overflow：当一行的文字在一行中放不下，但又不适宜（不允许）换行时（通常是标题性质的文字）。</p>
<ul>
<li><p>该属性的设置有三个前提：</p>
</li>
<li><p>1）盒子的overflow为非visible，通常为hidden；</p>
<p>2）盒子的width为非auto，通常是设定为固定宽度；</p>
<p>3）文字的换行特性white-space为不允许换行（nowrap）；</p>
</li>
</ul>
</li>
<li><p>box-sizing：设置盒子内容区的大小。默认的盒子模型中，width和height设置的是内容区的大小。也可以通过该属性 设置width和height所包含的区域：</p>
<ul>
<li>content-box：默认值，width和height只是内容区大小</li>
<li>border-box：width和height是包括了边框+内边距+内容的总的大小，实际的内容区域只有<code>width/height-边距-边框</code>的大小</li>
</ul>
</li>
</ul>
<ul>
<li>vertical-align：垂直方向对齐</li>
</ul>
<p>vertical-align  这个看上去很美好的一个属性， 实际有着不可捉摸的脾气，否则我们也不会这么晚来讲解。</p>
<figure class="highlight"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">vertical-align : baseline |top |middle |bottom </span><br></pre></td></tr></table></figure>

<p>设置或检索对象内容的垂直对其方式。 </p>
<p>vertical-align 不影响块级元素中的内容对齐，它只针对于 行内元素或者行内块级元素，特别是行内块元素， <strong>通常用来控制图片/表单与文字的对齐</strong>。</p>
<ul>
<li>vertial-align有一个特别的应用 是用来去除3px bug</li>
</ul>
<p>图片或者表单等行内块元素，他的底线会和父级盒子的基线对齐。这样会造成一个问题，就是图片底侧会有一个空白缝隙。</p>
<p>解决的方法就是：  </p>
<ol>
<li><p>给img vertical-align:middle | top等等。  让图片不要和基线对齐。</p>
</li>
<li><p>给img 添加 display：block; 转换为块级元素就不会存在问题了。</p>
</li>
<li><p>设置父盒子的font-size:0。</p>
</li>
</ol>

                      

                        
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            缺失模块。<br/>1、请确保node版本大于6.2<br/>2、在博客根目录（注意不是yilia-plus根目录）执行以下命令：<br/> npm i hexo-generator-json-content --save<br/><br/>
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    pages: false
    posts:
      title: true
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